/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Operations/MeshConvexHull.h
Choose a more or less evenly-spaced subset of mesh vertices. Conceptually, this function creates a uniform grid with given cell size. (Cell size is given roughly as a percentage of the total mesh bounding box.) Each grid cell can hold up to one vertex. Return the set of representative vertices, maximum one per cell.
static void GridSample ( const [FDynamicMesh3](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3) & Mesh, int GridResolutionMaxAxis, [TArray](API\Runtime\Core\Containers\TArray)< int32 > & OutSamples )